/Engine/Plugins/Runtime/CommonUI/Source/CommonUI/Public/CommonTabListWidgetBase.h
Registers and adds a new tab to the list that corresponds to a given widget instance. If not present in the linked switcher, it will be added.
True if the new tab registered successfully and there were no name ID conflicts
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=TabList) bool RegisterTab ( [FName](API\Runtime\Core\UObject\FName) TabNameID, [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< [UCommonButtonBase](API\Plugins\CommonUI\UCommonButtonBase) > ButtonWidgetType, [UWidget](API\Runtime\UMG\Components\UWidget) * ContentWidget, const int32 TabIndex )